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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ee6b823bb9b46c047aeae9ef979e9492efe8cfad3df6e4ae3f0272d5e0a409' 
  AND token = 'lhaRkxMLLkcFjo/hSjIFaHw0NF6W+wVukEkdB5qDrrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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