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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b783c51541b1ae169f8b00630a34bf372a44eaf7440460a99d9241e7fff3c8ce' 
  AND token = 'YX30SaU1ZOxuZLtKUEaP1rLzq4Of2oTSwOHT1X/68+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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