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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c5a4c29a5f19aa2a9c72d25d35e5ec5a7b1d3766decccf328279b82e7bf4c6e' 
  AND token = 'awAtWAYiZn8UjMGiNFSGtqs34ru03s7Dls+0E3yoDS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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