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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5c58852b589feade428528674e710b166abeabf9943111cfa065576f0c7ed70' 
  AND token = 'HifGSglVb8RHVitTER+HgUxqQHw2u1jJJu/p9fR1V9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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