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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a69f0fe36b3c32e08f26d6d1e44325735c92d4a95f826f0ff287d0fb0952667' 
  AND token = 'boeiyUXd352xAQ40BZBOyq2PvHrd2r4E1f3ht29b7nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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