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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7cd5a67b5553e9e4a2dfbb02ea34f35b615e4d4634a6e00d8e20f9ab97baaae' 
  AND token = '/bd4ivP7lewkZtm7fQm3syC9bw0T3349CW02M74Fx74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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