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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b118235d6202ab026d1fdbcc7725866e431334a5641bd72ba2fff2ae30cd5be' 
  AND token = 'okK3GTj6rUWmUrVMjywvB7tjjHtOcQ271DFBAjBM1NA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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