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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33a2e57ac4cb69e13fa1c11fde0646f12983c560bb295a7744a5fb04e014ad00' 
  AND token = 'LTnQQZr/ewMSzebdlTtILciqa2NRDzaVO67Y/es6V/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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