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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29f45470aa645d0197e563a06c0aa8ac9c8e2acf6eac04fee4626633a5cd4036' 
  AND token = '5VvCTR9EjNL73kahgqkLJuNL/dNSVBRORzGzTOafaSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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