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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c3495427e4f523ce1cba07326c516043699c2d2515384872239c68e79c39def' 
  AND token = 'v0DAMYdCEwHU96T5OqH+vrQupKC69yXS+LwczHjY0zU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

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