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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ade6285a39e610b669e0927653b7fbcfc0a917d95f01083c3978d0b5725e574' 
  AND token = 'exd8rz397p9F8/qPDejtnxJtvLMArQFM7jx04PczLHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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