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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c6153fbac0d88b4e942e853cc40b033e502c7bf090fcb13f4efd693a7c46cda' 
  AND token = 'mmpXnL0ddi6YnEcj05cIh5G9g1d2bejlY4IA9tteioo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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