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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97dc1fb1df9d97fe9d58e6604d64ca0b22a695992bd50b8f334efccc8a91c547' 
  AND token = 'qWPJbdohuEo7sNn0/7aIHNYAsX2/N+JgGTIIIOD+mSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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