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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58ba5da1ebc5c30e21da78effaf7db5cc849ffac710a3bcc63880ecb8e5c09bc' 
  AND token = '3uuXKtgRkNBxpH/a13Do/npkeADAizpHO//uEeoXQeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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