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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e271bd2932707e3e34b3ddc25752c190b630394924c1e4db4fad478c1ab6862' 
  AND token = 'FlkBA0uFsnl4UzHi/oH+dS5c6YMw82HE1yPbA0FqRfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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