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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c36a59cf1f4412e55baf309f2f65a277425f7d366aaabfcb929c00fc9661759' 
  AND token = 'bJAGsX2PhpbH9pZ8cZkPfftj+WamKE1cIpNY9X7dXuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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