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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3173f02a5b793c078409d0f9c33824ec8399c77b61edaf9f6392a15632385d1' 
  AND token = 'FE8/4hJ8IFPA7ogQpCBcXirl+EWeDhhmjG8wao5ar1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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