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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa5ec17e4608b5fe64c6e06cb67e07304a88e385d1fd08bae3c70cefe71e6298' 
  AND token = 'QD1XPUxYUFcwpy3ybWt2JPQ2vIX7Ypt0EVuzaXjxpmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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