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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34ead372dfd8d4820dac33a4759d1293f2fe33f4b1695070d0d9103f9815ac67' 
  AND token = 'KyTwwQPpuwEuiG4tQPYuJ3jWqCer2SxJv2GuymshMi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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