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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fc7cd8d04ede22eb0ccd72320d8416a1a4ef58d52597a920b75f7878c7805a3' 
  AND token = 'cGEUtrfmQxM7HrmXX840LWuQoSE9ZygM2T9xAmgJ2w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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