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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f83f3bcfeca20b5bb0344b05085eb18cad99de30df46366a55576c966d736c54' 
  AND token = 'GSV66d/ScLK+Rw0sbw20aogax99XT1c1J8DYny31UdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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