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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84bd0d10aad93913a6e6f4d30ef433abc3917fca7f9f310d2fc8441de3ae7fe1' 
  AND token = 'WH3IAvxRlltm+ixhno4EiaTc7CVeQX8qOVLIjOmU6/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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