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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71fa836381f8a27c891a48f33dc9d2e84c5082c628a2daf3268af52b7b746d57' 
  AND token = 'bdiEnGf7396mfct98SOBUbgUJCGQU+Es63pqfPeqEXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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