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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '039546d5b37d1aaba5035a621d7bb9e845dd2b52472fa744ed5d4e41799d6631' 
  AND token = 'yfriAHlKzveH03CWfHdyD9/ZRtY1x66yAYppxa2uXLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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