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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '507373a3efc717264f9a57d561786fc1220a34950f2bf04df7ebbe4a41479b6d' 
  AND token = '2DTaDBAgYC9kgYpa9rAuEL+GLDIn5Xejx13zx11Ww38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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