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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43ecdb97c68d96f96f6c3f100135860d534bfc0ef9dd627021cee400a54d714b' 
  AND token = 'SWfmCHXtg/0/NLbzqanV/bmxR8yLK4T3xMarnSBXZw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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