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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b00ccf148b4f36ef0bfc964239cc560910425c4c4fb6786f36c7d505cf1e9a92' 
  AND token = 'SYf78AIh2o9pNi9zevS8tSmFhSo9XJkCLOPS32nc9tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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