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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f93d446d6025aa6f1b80e16afaab75efd86e2c8b1e91c22d8465d1adc0b32ad' 
  AND token = 'f00KM0dOkpeLsOQU4iMGhUQvhDvB/v+B77Az6O8xC+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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