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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ae70ca497a35e78bfc1fea809dc7b2c9b4b469becf7bd1efdcc20b35034e77c' 
  AND token = '6OwGEyZb3pLjAUCJcJ4jnTDI/53xTY9bv16IiIB38bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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