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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96becee8cac272b9acf86026ffb34378f07eea67d28ac2a0a926ea2481a0f56b' 
  AND token = 'BfX1HvcDwHrjxvsMV8+di41xCDNU0wVGxY8lS90SFU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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