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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f1bf6645a52b640dfa484a5dcf0a0e03131db13ccde6a6a0d886dda8f00fd5d' 
  AND token = 'omnWKDn71cFsq181r2WQVC2MHP2ADi9raIhU+VTwnDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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