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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1626a2b404ab5cdb81a57bad83c5e7ab796abd1c7d966cdbdd251b3822bb9bc8' 
  AND token = 'kY8ioOMGFsflFvB2xbxemrkWV0PB49KX0C3q8/Py+aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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