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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c8e7b2e5e5916eb595162e8949274386aa7bf3dbfd91c00a2af074632ae619c' 
  AND token = '6AC6ZdUJCfqrzLfdJZx7bcWKUSq9zdH/nHQkKVX0CX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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