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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8df45f9d90bf037e91e50213e7f40faf16d10ac9c3a538bf9cb2beadf49047f' 
  AND token = 'QyvDFDu0ZTpWfq2gO12n7lOnYsy1zWrjrlM67EFh5yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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