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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b547da82c105b05d9208c13e6b73e110603e3b35762c513b93d57fed5a6d7607' 
  AND token = 'uFFYmCLuUkhJAu4l0MEtFg/Eepk9Gq0HmwxEw6+fJ0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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