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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f236cb8e11e243d5f30e0084b4ca9c4c88fc5dd7554a7eb831b6530d058912dc' 
  AND token = 'Dj9tu+Mv4Yb7Y6p9Gf1j4m+xWT9ewug6XshaI8kmKIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}