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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9be81b5dad92f3aad65478117bb137986151ec6d2e2ca1af7568eda6f1a81d57' 
  AND token = 'R+bsoG7BMQXMZH4VoVCMkTPNzTGBpkXcN+VF0dlZYEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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