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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c82c6a522a8b5ea35bb063995becfbf6dbb018cab821b60bc5d4fc1d59dc3d4' 
  AND token = 'yjK1vEVq7nG5Vcf562HNJpL7CfZgecrEonnkYaDVlrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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