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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2bfc3a654e8017a7316cbaa4303dfd6cc1b4fefbc9fec350c824d5686ba22b5' 
  AND token = 'mQ+lFIpjvPCfYyPXZuzc/asS1xadxQxJI56c1AOaqoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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