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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b9294d58a962e53d6892d41aae0c8bd1d8fcd713fb4f3cd4350671f4e9ab9f' 
  AND token = 'wjbt/iGDiANWtzHPLuIiPpFx2sEp8sBkcCP35Zk4eBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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