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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ebccbeafc01f2f1d23778d2dec778a2b61b36536b8f0e8483c699fb78577080' 
  AND token = 'yHmDtoI98o/Hq6Xiw+VLf1Hwk65EUtveXr2emHqgHFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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