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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d9145a36341bf9fae33a5daf1ee38545c2ae373a0c09742375b31754393de17' 
  AND token = 'd4fUYcEZJBKE5VOWs74eXWcCGDwnBaYVi85ikfaOMuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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