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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab0e7956083cc4c546af0baa20762b25e9d5620cde19bfe0bb28e6cc6426c0d9' 
  AND token = 'uZnE0I83NP0VbO52jTnjxs0t7uR9USOVhY+itV9fRjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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