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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '694f1ffff8a35ef0aa9234a6767f918dd705880bf6df6fafe27b1421c30ac2bc' 
  AND token = 'W4kMSRRe3nlRzoHuzSXgzAbUImaPTYbBpMMrWnZFJy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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