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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd20abd9f3a1fad8c987b60687a915db6a2e3b0eb1a82444df8133a97c2ca032' 
  AND token = 'OIbUPrcpUxQ+H7jQbXwhd79TumNZJ7r+373bzGs0QlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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