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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24da4a701f1d450e747865ca4488de053bf74cb0fc25bb3d8978e9c25526996f' 
  AND token = 'frYoWzlIN1iMnwEfnpjbClT1ILx2/0Q80tZHDFSNjw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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