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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de019d04cd8f04be3834645cad536213b2fec9a523f6a15ca36b508123a0b10d' 
  AND token = 'YE717TWDpYSPWA1FT2WOxxIjCaRkw8GHONsf/g+BZ5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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