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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c71e8f0473d176328e89eb056503c1cb4c4f8ebe3a61be2476d47d6bc1f9949e' 
  AND token = 'fUBAb7cJYZ4UHO2wddfHvMQWZyWLfc1EqGIyXfloeYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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