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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb6a76edd71e0d76ddae8b45feaa86d30c29ca53d047075ad8c2922894d5d0a' 
  AND token = 'Qv9QEwtjhvp4t+izWTS9WUbx4akUonEWb9cDrn76g6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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