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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad2c1cb633fa9ea03e7f8dbc390950338be9ecac3591eb02e9a3981e2a32048b' 
  AND token = 'x7FuwGprtlwCSHWbisuZtHN25k4OKzjzS8Tkev+NUtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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