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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33924348751b89a7e4abbdc4a197e1abfe4b7b41faaadc9c5799e6fe3a5f44de' 
  AND token = 'AB1B5B00RLRll002xwzA7Rta677koECfx/jEvpt2Jgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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