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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14cdea995b4f76efe3af14b1a2943f88549f759ca85ec59149b1b00f7bb421e4' 
  AND token = 'xrz8Mb03cyAVuY/bbBciSKXtvXYyt8RCmtiGhLQO88w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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