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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15023b6b38eb1e4619e45deb1407becbd31cbba9b8a7360fe998625124466ba1' 
  AND token = 'cH6etivmUm/gbNUXHEJP/GU9q6ho2Vd7+qIJJMVG0ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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