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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0023f88f70a933b47d163a51b4bd0008f9e5b09bfd72bbc3c96ab8eb4dc8c7c1' 
  AND token = 'Yaz3T12mbnltrmEBjivhJcFxkF84ZDmtc/j7XyKUm94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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