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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '028cb371ac53d68ee0d72a2041283c19176fe62d5e7e054f8f752a60ffc12f23' 
  AND token = 'GjMUaVBeihvkW5L0eTN4WtiDnxJL4WlqATJ9dk2WPz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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