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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7bb28afb0b5929c2aa343ee0ca26358e8da6414a74d12cf901855d605ab0b12' 
  AND token = 'z6wChT1yEiznuCJ6FBCkieKRRdxd6y2MfLzFK0MuGLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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