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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e23309d92318a4785733ae7013164b2de6f51fec94e43e052031708ca1c6bcbf' 
  AND token = 'g74CDfPEdb+uBHMlTnHJbooIVxH1Rfa7rCRgRFE6q00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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