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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '047b7ff5fd8dae307bdeaeb5dda1f5512eae56661de27cfbcef5d31e6a2c765f' 
  AND token = '21Mdx+k1GKy/qgNR+ONvdpu5YPLQk3+yUQm6NoT20qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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