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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fc0e9c324937bbb1b03783d2fcf8ddf7056ae7b394323206e5e9a8d18d554df' 
  AND token = '1K+deOVt0A/S8pTNt1r2HEiUa8yagwwsdnOZQaakLBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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