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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e242395749d45a35c26a4a4bdccbfcbf9fab0068914cea148a524c9e686ed128' 
  AND token = '3F2QYnnxAHs/fdS5eLVlQ1dAcyw0iklaeNww7Ur/GNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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