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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cd86da5d878f0550258be766962d5c90a203b6c0cdf84e439e4124dbb8a4b44' 
  AND token = 'gt1cJ9wPOUcE6Z3FnL5XP30wPbB3ikOBpyYNuO+ssoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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