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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bef9e77a2dda847f15935bbeb6588d3948b2d2237d6967c5f3b0e79f1e2d8081' 
  AND token = 'XjN8iyeLcrR9ugMcjBMyvkb12Rb8ttAfsh9BArUj96Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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