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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f825b6626de944afc36346bcbd5c2caeb6df8cc336075b8f9ac031dd4962603' 
  AND token = '6/UiIUtrkFl3Yq6Msy8BPWcZhRRA62XdQ4+HROQuLR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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