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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df2bda656899c7a6829de361d157a92c49457c4b74d2da9b5aa1ac5d17431360' 
  AND token = 'WXa9vtkKKw+ynx568gRgXqbCKMDLNmc0o6lLXa5v5Hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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