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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54ff2612e1e3ebe68a1bcaeffc65603bb6d53441797cca7be13f0162730390c9' 
  AND token = 'qBcIqSJGv3mf4Ia3/vr8K+ytB2gWvug1AGCGIotaKjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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