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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cc12422fbe8f7a524e893e023ae6b0ea03382afd9e1d7259766b093a1ca16ed' 
  AND token = '3Ahqu5B8hDzqR5uHYt3mI7ZfFRI9up9U0wavmUqAkIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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