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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de1c918fb65df7a2eb0e79d157ac261640a8e1e3198626927f4e7d4a858f260c' 
  AND token = '3DazVXYwhIONLtYBr17gfpADQ35enfH0R06JtvYfSbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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