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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e1e6a7a68cd7eb19bab2e226159250a9130479b66e8995f0bb982df60e942b6' 
  AND token = 'BbZZNWfmnG2vkZSFhtgjpLWiXjBxbFEfXw0T7H/RDOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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