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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53fdf250e8e079c69124288a4ab523faea895474bdb55a4a20ccc7d331e04cc8' 
  AND token = 'kGwMgx0g7CJxjR339PjiXyNtaHLU5mw3JIgfR4umTkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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